/*
 * Copyright 2002-2012 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.springframework.aop;

import java.io.Serializable;

/**
 * Canonical Pointcut instance that always matches.
 *
 * @author Rod Johnson
 */
@SuppressWarnings("serial")
class TruePointcut implements Pointcut, Serializable {

    public static final TruePointcut INSTANCE = new TruePointcut();

    /**
     * Enforce Singleton pattern.
     */
    private TruePointcut() {
    }

    @Override
    public ClassFilter getClassFilter() {
        return ClassFilter.TRUE;
    }

    @Override
    public MethodMatcher getMethodMatcher() {
        return MethodMatcher.TRUE;
    }

    /**
     * Required to support serialization. Replaces with canonical
     * instance on deserialization, protecting Singleton pattern.
     * Alternative to overriding {@code equals()}.
     */
    private Object readResolve() {
        return INSTANCE;
    }

    @Override
    public String toString() {
        return "Pointcut.TRUE";
    }

}
